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Posted to common-user@hadoop.apache.org by jiang licht <li...@yahoo.com> on 2010/04/21 21:19:13 UTC
confusion about dfs.replication
A trivial question. So, here it is: according to the hadoop documentation,
"dfs.replication" defines the number of replications of a block. So, if
"dfs.replication" is set to N, then that means each file has actually
(N+1) copies. Is this correct?
Thanks,
Michael
Re: confusion about dfs.replication
Posted by jiang licht <li...@yahoo.com>.
Thanks Eric. I found this out simply from viewing blocks and their locations in UI (maybe some commands will also report this, forgot which one).
Best regards,
Michael
--- On Wed, 4/21/10, Eric Sammer <es...@cloudera.com> wrote:
From: Eric Sammer <es...@cloudera.com>
Subject: Re: confusion about dfs.replication
To: common-user@hadoop.apache.org
Date: Wednesday, April 21, 2010, 2:20 PM
Just N copies. There's no notion of the "original" copy of the data.
On Wed, Apr 21, 2010 at 3:19 PM, jiang licht <li...@yahoo.com> wrote:
> A trivial question. So, here it is: according to the hadoop documentation,
> "dfs.replication" defines the number of replications of a block. So, if
> "dfs.replication" is set to N, then that means each file has actually
> (N+1) copies. Is this correct?
>
> Thanks,
>
> Michael
>
>
>
--
Eric Sammer
phone: +1-917-287-2675
twitter: esammer
data: www.cloudera.com
Re: confusion about dfs.replication
Posted by Eric Sammer <es...@cloudera.com>.
Just N copies. There's no notion of the "original" copy of the data.
On Wed, Apr 21, 2010 at 3:19 PM, jiang licht <li...@yahoo.com> wrote:
> A trivial question. So, here it is: according to the hadoop documentation,
> "dfs.replication" defines the number of replications of a block. So, if
> "dfs.replication" is set to N, then that means each file has actually
> (N+1) copies. Is this correct?
>
> Thanks,
>
> Michael
>
>
>
--
Eric Sammer
phone: +1-917-287-2675
twitter: esammer
data: www.cloudera.com